Petrography, mineralogy and geochemistry of the Ighrem diabase dyke (Anti-Atlas, Southern Morocco)

  1. A. Touil 1
  2. R. Vegas 2
  3. A. Hafid 1
  4. R. Palomino 2
  5. A. Rizki 1
  6. A. Palencia 2
  7. V.C. Ruiz 2
  1. 1 Cadi Ayyad University
    info

    Cadi Ayyad University

    Marrakech, Marruecos

    ROR https://ror.org/04xf6nm78

  2. 2 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

Journal:
Revista de la Sociedad Geológica de España

ISSN: 0214-2708

Year of publication: 2008

Volume: 21

Issue: 1-2

Pages: 23-33

Type: Article

DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Revista de la Sociedad Geológica de España

Abstract

The Ighrem dyke is one of the two great doleritic dykes of the Central Atlantic Magmatic Province (CAMP) occurring in the Anti-Atlas Ranges (Southern Morocco). Its chemical composition corresponds to quartz-normative tholeiites showing, away from the dyke’s borders, an increase in the Si, Zr and Ce and a decrease in the Fe2O3 * , Ti O2 and Nb contents respectively. The bulk chemical compositions, together with those from pyroxenes, substantiate the character of continental tholeiites for the rocks forming the dyke. Trace element ratios Zr/Nb = 12 to 17 and (La/Ce)N ~ 1.29 are indicative of an enriched mantle source akin to that of the E-MORB. Fractional crystallisation is the main mechanism of differentiation for these rocks and their final geochemical signature is due to the contribution of crustal contamination and secondary hydrothermal alterations.

Data source: Dialnet